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US2709345A
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Method and apparatus for defrosting refrigeration coils
Assignee: Worthington Corp
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Filing: 1951-10-04
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Granted: 1955-05-31
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Expires: 1971-10-04
Abstract
No abstract record available.
Inventors
- 👤 Melvin A Ramsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:24
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022; F25D; F25D21/00; F25D21/002; F25D21/06; F25D21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE19988E
Cited
US1970340A
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US2452102A
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US2459173A
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US2511419A
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US2554848A
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US2526379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |